Verna's Makes All Sales on Account, Subject to the Following

Verna's makes all sales on account, subject to the following collection pattern: 20% are collected in the month of sale; 70% are collected in the first month after sale; and 10% are collected in the second month after sale. If sales for October, November, and December were $70,000, $60,000, and $50,000, respectively, what was the budgeted receivables balance on December 31?

A) $40,000.
B) $46,000.
C) $49,000.
D) $59,000.
E) None of the other answers are correct.